The latency I think is between the client added the message and received acknowledge from quorum of bookies. Journal device will significantly affect the latency, Ledger device might slightly affect but not too much (it depends). If you are using only one disk for both ledger & journal devices, you will definitely get really bad disk behavior.
At the mean time, your configuration on bookie journal (e.g. group commit interval, commit buffer) will also affect the latency. So for your case, please specify your environment and configuration, we will figure out why it takes to 2s. - Sijie On Tue, Aug 26, 2014 at 8:27 AM, Jaln <[email protected]> wrote: > Hi, > I'm running the bookkeeper benchmark on a single node, > The latency is about 2s using one disk. > I would like to know how this latency is calculated, > is the `latency' the time between "client sent the write msg" and the > "write is committed on the journal devices and the ack code is returned"? > > Does the ledger device affect the latency? Assuming ledger and journal is > on > different disk. > > Best, > Jialin >
